The hair cracks are mainly formed on the plastering layer. And mainly Hair cracks are often found on the column and brickwork joints. This happens becauseContraction and expansion for concrete occur more when compared to brickworks. Hence there's a difference between these and thus forms the crack.The expanded metal used for plasteringSmall chicken wire meshThe welded wire mesh used for inside plastering work Chain link fence used as plastering meshPlaster fibreglass mesh protects the wall surfacePlastic mesh used to plastering to a brick wall